A. to hold and protect the cells DNA B. to store food and other materials inside a cell
C. to store enzymes that Break down food
D. to use energy from sunlight to make surgars

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What produces wave a)sound b) heats c)transfer of energy d)vibrations

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.